Steam-turbine.



No. 822,317. PATENTED JUNE 5, 1906. J. STUMPF.

STEAM TURBINE. APPLICATION FILED SEPT, a. 1903.

Witnesses: /n Vania/ Johann Shun bf, f H

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wheels one after the ot er.

UNITED srargs PATENT orr ron.

JOHANN STUMPF, 0F CHARLOTTENBURG, GERIVIANY, ASSIGNOR TO GEN- ELECTRIC COMPANY, A. CQRPQRAIION OF NEW YORK.

arena-rename.

Specification of Letters Patent.

latented June 5, 1906.

Application filed September 53, 2903. Serial No. 172,246.

To all whom it may concern/.-

Be it-lmownthat 1, Jonas Srmurr, asubject of the King of Prussia, German Emperor, and resident of 2? Rankestrasse, 'Charlottem burg, near Berlin, in the Kingdom of lrussia, German Empire, have invented certain new and useful Improvements in Steam or Gas Turbines, of which the following is an exact specification.

My invention relates to steam or gas tun bines, and more especially to heroines for driving machines consisting 0? two parts working together in such a way that one of these parts is fixed while the other one rotates, as is the case, for instance, in centrifugal pumps, ventilators, dynamo-machines, and the hike. In centrifugal pumps, for instance, a bucket-wheel rotates in a fixed blade-rim or guiding apparatus, In dyn amo-machines an armature rotates in a fixed magnetirarne,

' situated Within the same rotates in the other .direction, and that in dynamo machines, or instance, not only the armature, but "also the magnet-frame rotates, this frame rotating naturally in the direction opposite to the direction in which the armature rotates. By this armangement great advantages are attained. It

. is well known. that it isvery advantageous to reduce the number of revolutions of a steam or gas turbine as much as possible. This can be attained advantageously by using two to;- bine-wheels rotating in opposite directions, as by thismeans the number of revolutions of each turbine-wheel amounts only to fifty per cent. of the number of revolutions of a single turbine-wheel having the same ei'iect.

A further great advantage of the turbinewheels rotating in opposite direction over turbine-wheels rotating in thesame direction resides in theiact that the guide-blades which reverse the direction of flow of the steam leaving one turbine-wheel are unnecessary.

As to the unachine to be driven, the new ar- I rangernent has also great advantages. In centrifugal pumps, for instance, the useful sheet is considerably augmented by the guidedirection opposite to the direction in which the bucket-wheel rotates, as on account of this construction the relative velocity of the fluid to bepumpcd comes in consideration illstead or the absolute velocity of the same.

In dynamo-machines it is very important to increase the relative velocity between. the armature and the magnets, as the velocity of the armature alone cannot surpass certain.

limits on account of it being impossible to construct the windings strong enough to off er sufficient resistance to the centrifugal power.

If now, for instance, the armature and the magnet-frame have both one thousand revolutions, the relative velocity of both parts is equal to two thousand "revolutions. This is very important for a direct coupling of a dynamo-machinewith a turbine, especially in case the whole arrangement shall occupy only a small space.

In order to make my invention more clear,

I refer to the accompanying drawings, in which several examples of t e arrangement showing the object of the present invention are shown, and in which- Figure 1 is a diagrammatic view showing the invention applied to a centrifugal pump. Fig. 2 is a diagrammatic View showing the invention as applied. to a dynamo-machine.

In the drawings, a is a solid shaft which is situated in the hollow shaft 1). At one end of the shafts a and b turbinewheels c and d of any convenient construction are fixed. If,

for instance, turbine-wheels of the Laval type are used, the nozzles cfor leading the steam to the turbine-wheel 0 can be arranged at the side of this wheel. as shown in the drawings. If the efiect of bot h turbine wheels shall be equal, both turbine-wheels may be impinged upon by fresh steam, or other convenient means for attaining this purpose may be provided. f is a bucket-wheel of a centrifugal pump,

vane rim not being fixed,but rotating in 2.960

too

which bucket-wheel is fixed to the inner shaft c. g is the guide-vane rim of the centrifugal pump and is fixed to the hollow shaft 1). The

fluid to be pumped receives a certain acceleration in the bucket-wheel f, which acceleration is considerably increased between the blades of the guide-vane rim 9, which rotates inthe opposite direction. In Fig. 2 i is the magnet-frame of a dynamo-machine, which ma et-frame is fixed to the hollowshaft b,

an it is the armature of this dynamo-machine and is fixed to the solid shaft a. Instead of connecting the field and armature as shown they may be reversedthat is to say, the armature may be the outer member, and

the field-magnet the inner member.

Having thus fully described the nature of this invention, what I desire to secure by Letters Patent of the United States is 1. 1h a device for driving machine elements in opposite directions, the combination of two turbine-Wheels adapted to rotate in opposite directions, means for rotating said wheels, a hollow shaft fixed to one turbinewheeland having a flange at its opposite end to which a machine element may be secured,

a shaft between the other turbine-wheel and another element passing throughsaid hollow shaft and flange and being entirely inclosed by the hollow shaft, substantially as described.

2. In a device for driving machine elements, the combination of bucket-wheels adapted to rotate in opposite directions, devices for discharging motive fluid a ainst the buckets, a hollow shaft attache to one bucket-Wheel, a second shaft attached to another bucket-wheel and located within the hollow shaft, said shafts driving independent loads, and an enlargement on one of the shafts 'to which a machine element may be attached.

In testimony whereof signed my name to thisrspecification in the presence of two subscribing witnesses. JOHANN STUMPF: Nitnesses:

HENRY HASPER,

WOLDEMAR HAUPT. 

